I guess no one read the article cause ...

"No cases of PML have been diagnosed in Tecfidera patients"

"Including the two case reports published Wednesday, a total of four patients have been diagnosed with PML since Fumaderm was approved in Germany in the mid-1990s for psoriasis, Biogen said. However, in two of the cases, patients had additional risk factors for developing the condition. Biogen has said in the past that the PML rate is consistent with what medical literature expects for patients with autoimmune diseases such as psoriasis"

Tecfidera is NOT Fumaderm.